Carbon holding device



y 9, 9 0- F. IACOBELLI ET AL I 2,207,570

CARBON HOLDING DEVICE Filed March 23, 1937' fiilflfii-w Victor Cassella BYMJW ATTORNEY.

IND

Patented July 9, 1940 PATENT OFFICE 2,207,670 CARBON HOLDING DEVICE Frank Iacobelli, West Haven, and Victor Cassella, Hamden, Conn., assignors to Harry Granville,

Jr., Scranton, Pa.

Application March 23, 1937, Serial No. 132,550

2 Claims.

This invention relates to carbon holding devices for use in arc light mechanisms and more particularly to a carbon holder for use with motion picture projecting machines.

The device of this invention is especially adapted to save carbons used in are light machines wherein at least one of the carbons is fed toward the other to maintain the arc therebetween and to compensate for the using up of the carbon when in operation. In such machines, and particularly in motion picture projectors, the carbons are disposed horizontally, and provision is made of a carbon guiding support for the end of the carbon, which guide is disposed adjacent the opposing carbon ends.

One of the objects of this invention is to provide an improved carbon holding device whereby the carbons of arc lights may be used until they are of minimum length and whereby the expense of carbon replacements will therefore be reduced to a minimum.

Another objectis to provide a carbon holder adapted to clamp a short length at one end of the carbon, to be held in turn in the carbon carrier of an are light mechanism, and which will readily move past the carbon guiding support, without interfering with the carbon guiding action thereof and thereby permit the use of a maximum length of the carbon.

A further object of this invention is to provide a carbon holding device of the above nature which will be relatively simple in construction, inexpensive to manufacture, readily associated with standard are light mechanisms, compact, ornamental in appearance, and very efiicient, convenient, practical, and durable in use.

With the foregoing and other objects in view, which will appear as the description proceeds, the invention resides in the combination and arrangement of parts, and in the details of construction hereinafter described and claimed.

A preferred embodiment of the invention is illustrated in the accompanying drawing, where- Figure 1 is side view of certain parts of an arc light mechanism used in one type of movie film projector and showing a carbon holding device, embodying the features and principles of this invention, associated therewith;

Figure 2 is an enlarged end view of the negative carbon, its support, and the holder of this invention, looking in the direction of arrows 2-2 in Figure 1;

Figure 3 is an enlarged side view of the carbon holding device of this invention; and

Figure 4 is a section taken on line 4-4 of Figure 3.

Referring to the drawing wherein like reference characters designate like parts throughout the several views, and with particular reference to Figure 1, It) indicates a reflector, through which a negative carbon carrier II is adapted to slide to feed the carbon l2 toward the positive carbon I3. The carbon 12 is supported adjacent its forward end, being used to create an are between it and the carbon [3, upon a stationary guiding support [4. The support I4, in order to properly support and guide the carbon 12 as it is being fed by the carrier II, is provided with a groove l5, see Figure 2, which has a surface contour fitting the surface contour of thecarbon guided thereby. Herein the carbon i2 is shown as being cylindrical in form, and therefore the groove I5 is semi-circular in cross-section and of a diameter substantially equal to the diameter of the carbon. The positive carbon [3 is likewise fed by a carrier I6 and is supported at its forward end by a stationary guiding support ll having a groove [8 therein, the contour of which fits the contour of the carbon I3.

In accordance with the features and principles of this invention a carbon holding device 20 is associated in combination with the above described parts, to obtain the desired results and advantages contemplated, among which are those referred to above. The holder 20 is provided with an elongated shank 2! which is contoured to fit an opening 22 provided in the carriers II and i6, and in which the carbons are usually clamped. The shank 2| extends rearwardly from a body portion or jaw 23 which is bored out at its forward end in alignment with the shank 2| to provide a socket 24 to fit and partially embrace the carbon to be used therewith.

Preferably the width of the body portion or jaw 23 is substantially equal to the diameter of the carbon 12 or I3. The socket 24 is preferably not less than one inch deep and has a fiat bottom 25 against whichthe end of the respective carbon will seat. The lower surface 26 of the body portion 23 is formed or curved to coincide with the form or curvature of the carbon. As shown, the socket 24 has no lower wall, it having been removed when the socket was formed, due to the diameters of the socket and the carbon being equal to each other, and to the width of the body portion. Due to this construction the lower surface of the holder 20 will also fit the contour of the grooves I5 or l8 in the support I4 or I! and the carbons [2 or l3 will be continuously under the guiding influence of the guides 14 and I7 even after their rear, or held, ends have moved past these guides.

The carbons l2 and I3 are clamped in their respective holders 2% by the forward end 27 of a clamping finger or jaw 28, which has its rear end 29 disposed in a longitudinally directed slot 38, provided in the curved lower surface 26 of the body portion 23. A lug 3i extends upwardly from the finger 23 into the slot 30 intermediate the rear end 29 and the forward end 21.

is passed through the body portion 23 and the lug 3!, whereby the finger 28 is pivoted to the body portion 23 and may be swung to clamp the carbon end, disposed in the socket 2G, to said body portion. A screw 33 threadingly associated with a threaded opening 34 directed downwardly through the body portion Zitand into the slot 3@,

engages the rear end 29 of the finger 23 to swing it into clamping engagement with the carbon disposed in the socket 24.

The finger 2c is formed relatively narrow. in thickness, see Figures 2 and i, and extends below the lower surface of the shank 2i, and of the carbons i2 and i3. Provision of a recess 35 in the bottom of the grooves 15 and 18 in the respective supports or guides Ml and H, see Figure 2, permits the holders 2!] to pass by the guides it. and I'll, while the respective carbon and its holder are supported in the grooves to maintain the carbons l2 and E3 in their desired opposed parallel positions which, in most instances, is with the axis of the positive carbon it slightly above, but parallel with, the axis of the negative carbon I2.

When in use, in cooperating association with an are light mechanism including the carriers I l and I5 and the respective guiding supports M and H, the holders 2%, extending as they do beyond the carriers 1 I and it, replace a considerable length of carbon which is usually wasted when such holders are not used. By being adapted to be fed past the guiding supports M and I1, while still maintaining the carbon in the desired operable position, the holders 23 further save carbon, by permitting the use of the carbons up to a point closely adjacent the forward ends of the holders 29. The form of the finger 23 whereby it may slide through a narrow slot 35 provided in the guiding supports M and I7, obviates any interference of this part with the free sliding of the carbons and the rear end of the holders 21!, upon the guiding surfaces formed by the grooves I5 and i8. The carbons l2 and [3 are not only firmly clamped in the holders 2!] by the fingers 28 but due to the extent of the contact of the A pin 32 v specific disclosure, but may be modified and em'-- carbon end with the surface of the socket 24 an eificient electrical connection therebetween is established and maintained. The sturdy construction of the holders 20, particularly the portion 23 adjacent the arc end of the carbons, insures durability against rapid burning by the arc.

While there has been disclosed in this specification a form in which the invention maybe embodied, it is to be understood that this form is shown for the purpose of illustration only, and that the invention is not to be limited to the bodied in various other forms without departing from its spirit and that the invention includes all the modifications and embodiments coming with-v in the scope of the following claims.

Having thus fully described the invention, what is claimed as new, and for which it is desired to secure Letters Patent, is:

1.,A carbon saver for carbon electrodes of the character used with vmotion picture projectors comprising, a stationary carbon support along which a carbon may be fed, said support having a groove to fit the contour of a carbon and a narrow slot extending below the surface of the groove, a carbon holder having a body portion formedwith an extension adapted to be clamped in an electrode holderiof a projection lamp, the body portionof said holder being formed to fit the contour of groove in the carbon support whereby the holder will move freely therethrough, a narrow swingable jaw portion extending below said body and adapted to move through the slot in the stationary support and means to swing said jaw to clamp a carbon between it and the body portion of the holder.

2. A carbon saver for carbonelectrodes ofthe character used with motion picture projectors 7 comprising, a stationary carbon support along which a carbon may be fed, said support having a groove to fit the contour of a carbon and a slot extending below the surface of the groove, a first jaw adapted to partially embrace an end of a carbon, said jaw having anarrow slot formed .ingly cooperating with one jaw and engaging the other to move said second jaw relatively to the first to clamp a carbon therebetween.

FRANK IAC'OBELLI.

' VICTOR CASSELLA. 

